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Time correlation system and method

a time correlation and time correlation technology, applied in the field of detecting and recording lowlevel light signals, can solve problems such as noise or curve distortion

Inactive Publication Date: 2012-12-25
OPTECH VENTURES
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  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

"The patent text describes a method for detecting and measuring low-level light signals with increased resolution and precision. The invention is based on time-correlated single photon counting (TCSPC), which uses a detector to measure the time it takes for a single photon to pass through a periodic light signal. The system uses a constant fraction discriminator (CFD) to trigger on the pluses of the detector, a second CFD to generate a timing reference, and a biased amplifier and analog-to-digital converter (ADC) to select a smaller time window within the full-scale conversion range of the TCSPC. The system can provide high-resolution detection of photons and can be used for various applications such as detecting and measuring the distribution of photons in a sample."

Problems solved by technology

Any non-uniformity of the channel width results in a systematic variation of the numbers of photons in the channels, creating noise or curve distortion.

Method used

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Embodiment Construction

[0023]Embodiments of the present invention are more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein may be apparent to those skilled in the art. As used in the specification and in the claims, “a,”“an,” and “the” can mean one or more, depending upon the context in which it is used. Several embodiments of the present invention are now described with reference to the figures, in which like numbers indicate like parts throughout the figures.

Time-Correlated Single Photon Counting Systems

[0024]FIG. 2 depicts a time-correlated single photon counting system according to an embodiment of the present invention. In FIG. 2, a laser 110 fires pulses at a target 101 from which the system collects photons for counting. Additional embodiments of the present invention incorporate such a system for Rayleigh scattering detection or Raman scattering detection. Both embodiments will be described in detail below....

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Abstract

A time correlated single photon counting system having a programmable delay generator triggered by a laser fire event detector. The system may be used for chemical agent detection based on Rayleigh scattering using optical time domain reflectometry techniques. The system may also be used for Raman detection using frequency to time transformations.

Description

RELATED APPLICATIONS[0001]This application is a continuation of patent application Ser. No. 11 / 873,337 filed on Oct. 16, 2007 now U.S. Pat. No. 8,072,595GOVERNMENT LICENSE RIGHTS[0002]This invention was made with Government support under U.S. Army contract number number W911NF-06-C-0039 and TSWG contract number N41756-03-4089. The Government may have certain rights in this patent.FIELD[0003]This disclosure relates to the field of detecting and recording low-level light signals with increased resolution and precision.GENERAL BACKGROUND[0004]Time-correlated single photon counting, or TCSPC, is based on the detection of single photons of a periodic light signal, the measurement of the detection times, and the reconstruction of the waveform from the individual time measurements. TCSPC makes use of the fact that for low-level, high-repetition rate signals the light intensity is usually low enough that the probability to detect more than one photon in one signal period is negligible. For ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01L31/107
CPCG01J3/44G01J3/4412G01N21/65G01N21/7703G01J1/46G01J3/027G01J3/2889G01J2003/1213G01N2021/1793
Inventor BASTIAANS, GLENNHANKINS, STEVECOLE, JERALD ALAN
Owner OPTECH VENTURES
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